C/E/L IS ON. code p0171 is what???

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Author Message   chris tolley (Rover4982) New Member Username: Rover4982 Post Number: 24 Registered: 08-2003 Posted on Monday, December 15, 2003 - 06:00 pm:    the check engine light is on on my 99 discovery II the code it is throwing is a P0171:bank 1 too lean. what would be causing it to run lean? ive checked vaccum lines, and everything is good. what else could be wrong. also ive noticed the check eng. light coming on/going off. but the wierd thing is that while running lucas fuel treatment, the damn light stays off! i know lucas makes a dman fine product but come on! any info would be greatly appreciated. regards, chris   Phil deGuzman (Powerslide) New Member Username: Powerslide Post Number: 13 Registered: 12-2003 Posted on Monday, December 15, 2003 - 08:46 pm:    Injectors?   Richard Garza (Rgarza) Member Username: Rgarza Post Number: 44 Registered: 05-2003 Posted on Monday, December 15, 2003 - 09:35 pm:    check the mass air flow sensor. Needs cleaning or replacing. also check air filter make sure that it is clean Richard   Bill Collett (Bcollett) New Member Username: Bcollett Post Number: 37 Registered: 07-2003 Posted on Monday, December 15, 2003 - 10:26 pm:    Chris, check out the posts under this thread "Running Lean codes p0171 & p0174." There is a lot of good information about these codes. Bill